板料冲压成形过程摩擦特性数值仿真

为了掌握摩擦力在冲压成形过程中的变化规律及不同润滑条件对摩擦特性和成形质量的影响,该文依据摩擦理论和有限元理论,提出等效摩擦系数的概念,将摩擦力产生的机理与有限元数值仿真技术有机结合,分析不同润滑条件下板料冲压成形过程中的摩擦特性。研究表明：摩擦系数增大将导致冲压成形后期摩擦力快速增加,产品成形质量评价指标降低;在润滑条件确定的情况下,可知成形过程中摩擦力的主要成分是黏着区产生的摩擦力,黏着区、边界润滑膜区、犁削区和润滑小池区产生的摩擦力占总摩擦力百分比的比值为65.3∶16.9∶15.6∶2.2。通过研究不同节点摩擦力随时间变化曲线发现,板料减薄区和起皱区的摩擦力变化规律完全不同。研究对进一...

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Bibliographic Details
Published in农业工程学报 Vol. 30; no. 23; pp. 79 - 85
Main Author 郑燕萍 王列亮 沈思琳
Format Journal Article
LanguageChinese
Published 南京林业大学汽车与交通工程学院,南京,210037%西交利物浦大学数学系,苏州,215123 2014
Subjects
冲压
冲压成形
摩擦
摩擦机理
摩擦特性
数值仿真
数值分析
质量指标
冲压成形
数值分析
摩擦机理
摩擦特性
stamping
friction
摩擦
冲压
friction characteristics
numerical analysis
stamping forming
friction mechanism
质量指标
quality index
数值仿真
Online AccessGet full text
ISSN1002-6819
DOI10.3969/j.issn.1002-6819.2014.23.011

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Summary:为了掌握摩擦力在冲压成形过程中的变化规律及不同润滑条件对摩擦特性和成形质量的影响,该文依据摩擦理论和有限元理论,提出等效摩擦系数的概念,将摩擦力产生的机理与有限元数值仿真技术有机结合,分析不同润滑条件下板料冲压成形过程中的摩擦特性。研究表明：摩擦系数增大将导致冲压成形后期摩擦力快速增加,产品成形质量评价指标降低;在润滑条件确定的情况下,可知成形过程中摩擦力的主要成分是黏着区产生的摩擦力,黏着区、边界润滑膜区、犁削区和润滑小池区产生的摩擦力占总摩擦力百分比的比值为65.3∶16.9∶15.6∶2.2。通过研究不同节点摩擦力随时间变化曲线发现,板料减薄区和起皱区的摩擦力变化规律完全不同。研究对进一步提高板料冲压成形质量有着理论和工程意义。
Bibliography:11-2047/S
In the sheet metal forming process, the friction force between the sheet and the die is extremely complex, and its rule is not understood well enough. Based on friction theory, the friction force is divided into 4 components： the shear stress on the adhesion area, the shear stress on the boundary lubrication area, the ploughing force caused by protuberance on the die, and the shear stress on the area with much lubrication. Automobile panel products with high quality shall have no quality defects of stamping forming, such as fracture, wrinkle, spring back and surface defect, and the material flow of product shall be uniform and the thickness changes also shall be uniform during the forming process. Therefore, this article proposes that stamping forming quality index which includes defect quality index and thickness variation uniformity quality index. As different types of automobile panel contain different materials and have different quality problems, the defect quality index of different panels will
ISSN:1002-6819
DOI:10.3969/j.issn.1002-6819.2014.23.011